obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 48 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/specs/size_clause2.ads b/gcc/testsuite/gnat.dg/specs/size_clause2.ads
new file mode 100644
index 000000000..957d3920f
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/specs/size_clause2.ads
@@ -0,0 +1,48 @@
+-- { dg-do compile }
+
+package Size_Clause2 is
+
+  -- The alignment of the record is capped to the greatest power of 2
+  -- factor of the size, so that the real size is 40 too and the size
+  -- of a component of type R1 in a packed record can be 40.
+  type R1 is record
+    I : Integer;
+    B : aliased Boolean;
+  end record;
+  for R1'Size use 40;
+
+  type S1 is record
+    rr : R1; -- size must be 40
+  end record;
+  pragma Pack(S1);
+
+  -- The record is explicitly given alignment 1 so its real type is 40 too.
+  -- The size of a component of type R2 in a packed record is naturally 40.
+  type R2 is record
+    I : Integer;
+    B : aliased Boolean;
+  end record;
+  for R2'Size use 40;
+  for R2'Alignment use 1;
+
+  type S2 is record
+    rr : R2; -- size must be 40
+  end record;
+  pragma Pack(S2);
+
+  -- The record is explicitly given alignment 4 so its real type is 64.
+  -- That's not OK, because the size of a component of type R3 in a packed
+  -- record cannot be 40 so the size clause is violated.
+  type R3 is record
+    I : Integer;
+    B : aliased Boolean;
+  end record;
+  for R3'Size use 40;  -- { dg-error "size for .R3. too small" }
+  for R3'Alignment use 4;
+
+  type S3 is record
+    rr : R3; -- size must be 40
+  end record;
+  pragma Pack(S3);
+
+end Size_Clause2;